The three pie charts present comparative data on the proportions of people who are worried about four various environmental issues in three countries – namely Zambia, Singapore, and Cameroon.
Overall, while the proportions of people who worried about overpopulation in Zambia and Singapore accounted for higher shares compared to that in Cameroon, pollution was smaller than the other issues in the countries given.
Starting with Zambia and Singapore first, while overpopulation and global warming in Zambia accounted for 43% and 29%, respectively, the corresponding figures for those in Singapore were lower, at 37% and 26%. On the other hand, waste disposal was as low as that of pollution in Zambia, with both figures standing at 14%, whereas the figure for those in Singapore showed a different pattern at 21% for waste disposal and 16% for pollution, respectively.
Moving on to Cameroon, global warming was higher than that of overpopulation, with the respective figures at 23% and 19%. However, there was significant difference between waste disposal and pollution, with the figures at 42% and 16%, respectively.